Blender resources for architects?
Some resources

Add-ons


Archimesh for creating architecture elements 


Download

Window Generator
Chimney Generator
Jamb Generator
Balcony Generator


Sites:


Blender 3D Architect


Video Tutorials:


Blenderguru: The complete architecture series
 Edit:This tutorial dates back to 2010, the rendering lessons use an external render engine since Cycles wasn't available. (Edited May 3rd 2016). 
Cgcookie: Interior 3d architectural visualization
Edit:CGcookie are no longer streaming this tutorial as " it's time for it to be put to rest" yet ZIP files are available to download the lessons.(Edited May 3rd 2016).


Related questions:


How to model effectively using exact measurements?
How do blender units and meters, feet, or yards correlate?
Is there any way to measure angle between edges/faces, or change the angle so that the mesh changes according to the angle we input?